U.S. patent application number 17/656471 was filed with the patent office on 2022-07-07 for battery and automotive diagnostic tablet.
The applicant listed for this patent is AUTEL INTELLIGENT TECHNOLOGY CORP., LTD.. Invention is credited to Huaming CHEN, Honghua Lu, Weikang Wang.
Application Number | 20220216528 17/656471 |
Document ID | / |
Family ID | |
Filed Date | 2022-07-07 |
United States Patent
Application |
20220216528 |
Kind Code |
A1 |
CHEN; Huaming ; et
al. |
July 7, 2022 |
BATTERY AND AUTOMOTIVE DIAGNOSTIC TABLET
Abstract
The present application provides a battery that has application
in automotive diagnostic tablets. The battery includes a battery
cell, a positive electrode interface, and a negative electrode
interface. The positive electrode of the battery cell is connected
to the positive electrode interface. The battery further includes a
first resistor and a protection chip. A first end of the first
resistor is connected to the negative electrode of the battery
cell, and the other end of the first resistor is connected to the
negative electrode interface. The protection chip includes a power
detection end and a communication interface, and the power
detection end is connected to the first resistor. The protection
chip is used to detect the power information of the battery cell by
means of the power detection end, and the power information is sent
by means of the communication interface to a microprocessor.
Inventors: |
CHEN; Huaming; (Shenzhen,
CN) ; Wang; Weikang; (Shenzhen, CN) ; Lu;
Honghua; (Shenzhen, CN) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
AUTEL INTELLIGENT TECHNOLOGY CORP., LTD. |
Shenzhen |
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CN |
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Appl. No.: |
17/656471 |
Filed: |
March 25, 2022 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
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PCT/CN2020/118154 |
Sep 27, 2020 |
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17656471 |
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International
Class: |
H01M 10/42 20060101
H01M010/42; G01R 31/3842 20060101 G01R031/3842; G01R 31/396
20060101 G01R031/396 |
Foreign Application Data
Date |
Code |
Application Number |
Sep 30, 2019 |
CN |
201910940281.1 |
Claims
1. A battery, comprising a battery cell, a negative electrode
interface, and a positive electrode interface, the positive
electrode of the battery cell being connected to the positive
electrode interface, wherein the battery further comprises: a first
resistor, wherein one end of the first resistor is connected to the
negative electrode of the battery cell, and the other end of the
first resistor is connected to the negative electrode interface;
and a protection chip comprising a power detection end and a
communication interface, wherein the power detection end is
connected to the first resistor, and the protection chip is
configured to detect power information of the battery cell via the
power detection end, and send the power information to a
microprocessor via the communication interface.
2. The battery according to claim 1, wherein the battery further
comprises a switching circuit; an input end of the switching
circuit is connected to the positive electrode of the battery cell,
and an output end of the switching circuit is connected to the
positive electrode interface; the protection chip is further
provided with a positive electrode voltage end, a negative
electrode voltage end, and an execution end; the execution end of
the protection chip is connected to a control end of the switching
circuit; the positive electrode voltage end and the negative
electrode voltage end are respectively connected to the positive
electrode of the battery cell and the negative electrode of the
battery cell; when it is detected that a voltage of the battery
cell is higher than a first preset voltage, the protection chip
controls the switching circuit to be in a first state via the
execution end, wherein when the switching circuit is in the first
state, current of the the switching circuit does not flow from the
positive electrode interface to the battery cell, but the current
of the switching circuit flows from the battery cell to the
positive electrode interface; when it is detected that the voltage
of the battery cell is lower than a second preset voltage, the
protection chip controls the switching circuit to be in a second
state via the execution end, wherein when the switching circuit is
in the second state, the current of the switching circuit flows
from the positive electrode interface to the battery cell, but the
current of the switching circuit does not flow from the battery
cell to the positive electrode interface.
3. The battery according to claim 2, wherein the protection chip is
further provided with a current detection end; the current
detection end is connected to a link between the switching circuit
and the positive electrode interface, and the protection chip is
configured to control the switching circuit to be in the second
state via the execution end when the current detection end detects
that the current of the switching circuit is greater than a preset
current.
4. The battery according to claim 3, wherein the switching circuit
comprises a first switch tube and a second switch tube, a source
electrode of the first switch tube is connected to the positive
electrode of the battery cell, a drain electrode of the first
switch tube is connected to the drain electrode of the second
switch tube, the source electrode of the second switch tube is
connected to the positive electrode interface, the first switch
tube and the second switch tube both have a body diode, the body
diode of the first switch tube enables the current of the switching
circuit to flow from the battery cell in a direction of the
positive electrode interface, and the body diode of the second
switch tube enables the current of the switching circuit to flow
from the positive electrode interface in the direction of the
battery cell; the execution end of the protection chip comprises a
charging protection execution end and a discharging protection
execution end, the charging protection execution end being
connected to a gate of the first switch tube, and the discharging
protection execution end being connected to the gate of the second
switch tube.
5. The battery according to claim 4, wherein both the first switch
tube and the second switch tube are N-metal oxide semiconductor
(NMOS) tubes.
6. The battery according to claim 2, wherein the protection chip is
further provided with a resistance detection end; the resistance
detection end is connected to a thermistor in the battery cell; the
protection chip is configured to detect a resistance value of the
thermistor in the battery cell via the resistance detection end,
and control the switching circuit to switch off when a detected
resistance value is not within a preset resistance value range.
7. The battery according to claim 1, wherein the power detection
end comprises a charged power detection end and a discharged power
detection end; the charged power detection end is connected to the
negative electrode of the battery cell and a link of the first
resistor, and the discharged power detection end is connected to
the first resistor and the link of the negative electrode
interface.
8. The battery according to claim 7, wherein the battery further
comprises a first capacitor in parallel with the first
resistor.
9. The battery according to claim 1, wherein the communication
interface is an inter integrated circuit (I2C) interface.
10. An automotive diagnostic tablet, comprising a micro controller
unit (MCU), a charging chip, and a battery, wherein the MCU is
communicatively connected to the charging chip and the
communication interface of the battery respectively, and the
charging chip is electrically connected to the battery; wherein the
battery comprises a battery cell, a negative electrode interface
and a positive electrode interface, the positive electrode of the
battery cell being connected to the positive electrode interface,
and the battery further comprises: a first resistor, wherein one
end of the first resistor is connected to the negative electrode of
the battery cell, and the other end of the first resistor is
connected to the negative electrode interface; and a protection
chip comprising a power detection end and a communication
interface, wherein the power detection end is connected to the
first resistor, and the protection chip is configured to detect
power information of the battery cell via the power detection end,
and send the power information to a microprocessor via the
communication interface.
11. The automotive diagnostic tablet according to claim 10, wherein
the battery further comprises a switching circuit; an input end of
the switching circuit is connected to the positive electrode of the
battery cell, and an output end of the switching circuit is
connected to the positive electrode interface; the protection chip
is further provided with a positive electrode voltage end, a
negative electrode voltage end, and an execution end; the execution
end of the protection chip is connected to a control end of the
switching circuit; the positive electrode voltage end and the
negative electrode voltage end are respectively connected to the
positive electrode of the battery cell and the negative electrode
of the battery cell; when it is detected that a voltage of the
battery cell is higher than a first preset voltage, the protection
chip controls the switching circuit to be in a first state via the
execution end, wherein when the switching circuit is in the first
state, current of the the switching circuit does not flow from the
positive electrode interface to the battery cell, but the current
of the switching circuit flows from the battery cell to the
positive electrode interface; when it is detected that the voltage
of the battery cell is lower than a second preset voltage, the
protection chip controls the switching circuit to be in a second
state via the execution end, wherein when the switching circuit is
in the second state, the current of the switching circuit flows
from the positive electrode interface to the battery cell, but the
current of the switching circuit does not flow from the battery
cell to the positive electrode interface.
12. The automotive diagnostic tablet according to claim 11, wherein
the protection chip is further provided with a current detection
end; the current detection end is connected to a link between the
switching circuit and the positive electrode interface, and the
protection chip is configured to control the switching circuit to
be in the second state via the execution end when the current
detection end detects that the current of the switching circuit is
greater than a preset current.
13. The automotive diagnostic tablet according to claim 12, wherein
the switching circuit comprises a first switch tube and a second
switch tube, a source electrode of the first switch tube is
connected to the positive electrode of the battery cell, a drain
electrode of the first switch tube is connected to the drain
electrode of the second switch tube, the source electrode of the
second switch tube is connected to the positive electrode
interface, the first switch tube and the second switch tube both
have a body diode, the body diode of the first switch tube enables
the current of the switching circuit to flow from the battery cell
in a direction of the positive electrode interface, and the body
diode of the second switch tube enables the current of the
switching circuit to flow from the positive electrode interface in
the direction of the battery cell; the execution end of the
protection chip comprises a charging protection execution end and a
discharging protection execution end, the charging protection
execution end being connected to a gate of the first switch tube,
and the discharging protection execution end being connected to the
gate of the second switch tube.
14. The automotive diagnostic tablet according to claim 13, wherein
both the first switch tube and the second switch tube are N-metal
oxide semiconductor (NMOS) tubes.
15. The automotive diagnostic tablet according to claim 11, wherein
the protection chip is further provided with a resistance detection
end; the resistance detection end is connected to a thermistor in
the battery cell; the protection chip is configured to detect a
resistance value of the thermistor in the battery cell via the
resistance detection end, and control the switching circuit to
switch off when a detected resistance value is not within a preset
resistance value range.
16. The automotive diagnostic tablet according to claim 10, wherein
the power detection end comprises a charged power detection end and
a discharged power detection end; the charged power detection end
is connected to the negative electrode of the battery cell and a
link of the first resistor, and the discharged power detection end
is connected to the first resistor and the link of the negative
electrode interface.
17. The automotive diagnostic tablet according to claim 16, wherein
the battery further comprises a first capacitor in parallel with
the first resistor.
18. The automotive diagnostic tablet according to claim 10, wherein
the communication interface is an inter integrated circuit (I2C)
interface.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] The present application is continuation application of
International Application No. PCT/CN2020/118154, filed on Sep. 27,
2020, which claims the priority to the Chinese patent application
No. 201910940281.1entitled "battery and automotive diagnostic
tablet" filed on Sep. 30, 2019, which are incorporated herein by
reference in its entirety.
TECHNICAL FIELD
[0002] The present application relates to the technical field of
automobiles, and in particular to a battery and an automotive
diagnostic tablet.
BACKGROUND
[0003] With the popularization of automotive diagnostic technology
and the maturity of battery management technology, the integrated
development of automotive diagnosis is promoted. In the application
era of function-intensive products, more and more diagnostic
products have increasingly higher integration and increasingly
higher current. The improvement of battery charging and discharging
current requiring high battery endurance and accurate non jump of
the voltameter is a relatively concerning problem for the
automotive diagnostic personnel in the process of automotive
diagnosis.
[0004] At present, in a battery of a diagnostic tablet, a
voltameter chip is usually placed at the main board end of the
diagnostic tablet together with a charging chip, and is
electrically connected to the battery via a battery connector; the
voltameter chip needs to detect the voltage and current state of
the charging chip to judge the power state of the battery; since an
internal resistance introduced via a connector, a wire, and a PCB
trace is required in the middle, a voltage drop will inevitably
occur; the greater the current, the greater the voltage drop, which
will lead to a great error between a detection value of the power
of a battery cell by the voltameter chip and the actual state of
the battery cell.
SUMMARY OF THE DISCLOSURE
[0005] In view of the above defects in the prior art, it is an
object of embodiments of the present application to provide a
battery and an automotive diagnostic tablet having a small power
detection error.
[0006] The object of the embodiments of the present application is
achieved by the following technical solutions.
[0007] In order to solve the above technical problem, in the first
aspect, an embodiment of the present application provides a
battery. The battery comprises a battery cell, a negative electrode
interface, and a positive electrode interface, the positive
electrode of the battery cell being connected to the positive
electrode interface. The battery further comprises:
[0008] a first resistor, wherein one end of the first resistor is
connected to the negative electrode of the battery cell, and the
other end of the first resistor is connected to the negative
electrode interface; and
[0009] a protection chip comprising a power detection end and a
communication interface, wherein the power detection end is
connected to the first resistor, and the protection chip is
configured to detect power information of the battery cell via the
power detection end, and sending the power information to a
microprocessor via the communication interface.
[0010] In some embodiments, the battery further comprises a
switching circuit;
[0011] an input end of the switching circuit is connected to the
positive electrode of the battery cell, and an output end of the
switching circuit is connected to the positive electrode
interface;
[0012] the protection chip is further provided with a positive
electrode voltage end, a negative electrode voltage end, and an
execution end; the execution end of the protection chip is
connected to a control end of the switching circuit; the positive
electrode voltage end and the negative electrode voltage end are
respectively connected to the positive electrode of the battery
cell and the negative electrode of the battery cell;
[0013] when it is detected that a voltage of the battery cell is
higher than a first preset voltage, the protection chip controls
the switching circuit to be in a first state via the execution end,
wherein when the switching circuit is in the first state, current
of the the switching circuit cannot flow from the positive
electrode interface to the battery cell, but the current of the the
switching circuit can flow from the battery cell to the positive
electrode interface;
[0014] when it is detected that the voltage of the battery cell is
lower than a second preset voltage, the protection chip controls
the switching circuit to be in a second state via the execution
end, wherein when the switching circuit is in the second state, the
current can flow from the positive electrode interface to the
battery cell, but the current cannot flow from the battery cell to
the positive electrode interface.
[0015] In some embodiments, the protection chip is further provided
with a current detection end;
[0016] the current detection end is connected to a link between the
switching circuit and the positive electrode interface, and the
protection chip is configured to control the switching circuit to
be in the second state via the execution end when the current
detection end detects that the current of the the switching circuit
is greater than a preset current.
[0017] In some embodiments, the switching circuit comprises a first
switch tube and a second switch tube, a source electrode of the
first switch tube is connected to the positive electrode of the
battery cell, a drain electrode of the first switch tube is
connected to the drain electrode of the second switch tube, the
source electrode of the second switch tube is connected to the
positive electrode interface, the first switch tube and the second
switch tube both have a body diode, the body diode of the first
switch tube enables the current of the the switching circuit to
flow from the battery cell in a direction of the positive electrode
interface, and the body diode of the second switch tube enables the
current of the the switching circuit to flow from the positive
electrode interface in the direction of the battery cell;
[0018] the execution end of the protection chip comprises a
charging protection execution end and a discharging protection
execution end, the charging protection execution end being
connected to a gate of the first switch tube, and the discharging
protection execution end being connected to the gate of the second
switch tube.
[0019] In some embodiments, both the first switch tube and the
second switch tube are N-metal oxide semiconductor (NMOS)
tubes.
[0020] In some embodiments, the protection chip is further provided
with a resistance detection end;
[0021] the resistance detection end is connected to a thermistor in
the battery cell;
[0022] the protection chip is configured to detect a resistance
value of the thermistor in the battery cell via the resistance
detection end, and control the switching circuit to switch off when
a detected resistance value is not within a preset resistance value
range.
[0023] In some embodiments, the power detection end comprises a
charged power detection end and a discharged power detection
end;
[0024] the charged power detection end is connected to the negative
electrode of the battery cell and a link of the first resistor, and
the discharged power detection end is connected to the first
resistor and the link of the negative electrode interface.
[0025] In some embodiments, the battery further comprises a first
capacitor in parallel with the first resistor.
[0026] In some embodiments, the communication interface is an inter
integrated circuit (I2C) interface.
[0027] In order to solve the above technical problem, according to
the second aspect, the embodiments of the present application
provide an automotive diagnostic tablet. The automotive diagnostic
tablet comprises amicro controller unit (MCU), a charging chip, and
the above-mentioned battery, wherein the MCU is communicatively
connected to the charging chip and the communication interface of
the battery respectively, and the charging chip is electrically
connected to the battery.
[0028] Compared with the prior art, the advantageous effects of the
present application are as follows. Unlike the prior art,
embodiments of the present application provide a battery that has
application in automotive diagnostic tablets. The battery comprises
a battery cell, a positive electrode interface, and a negative
electrode interface, the positive electrode of the battery cell
being connected to the positive electrode interface. The battery
also comprises a first resistor and a protection chip. One end of
the first resistor is connected to the negative electrode of the
battery cell, and the other end of the first resistor is connected
to the negative electrode interface. The protection chip comprises
a power detection end and a communication interface, and the power
detection end is connected to the first resistor. The protection
chip is used to detect the power information of the battery cell by
means of the power detection end, and the power information is sent
by means of the communication interface to a microprocessor. The
battery according to the embodiment of the present application
combines the functions of power detection and battery cell
protection, and, by means of a protection chip, is capable of
directly detecting the power state of a battery cell with small
detection errors.
BRIEF DESCRIPTION OF THE DRAWINGS
[0029] One or more embodiments are illustrated by way of examples
with the figures in the corresponding drawings. The illustrative
examples are not to be construed as limiting the embodiments.
Elements/modules and steps in the drawings having the same
reference numeral designations represent like elements/modules and
steps, and the figures in the accompanying drawings are not to
scale unless specifically stated.
[0030] FIG. 1 is a block diagram of a circuit principle of a
battery according to an embodiment of the present application;
[0031] FIG. 2 is a block diagram of a circuit principle of another
battery according to an embodiment of the present application;
[0032] FIG. 3 is a schematic diagram of a circuit structure of a
battery according to an embodiment of the present application;
[0033] FIG. 4 is a block diagram showing a structure of an
automotive diagnostic tablet according to an embodiment of the
present application.
DETAILED DESCRIPTION OF THE DISCLOSURE
[0034] Hereinafter, the present application will be described in
detail with reference to specific embodiments. The following
embodiments will aid those skilled in the art in further
understanding the present application, but do not limit the present
application in any form. It should be noted that several variations
and improvements can be made by a person of ordinary skills in the
art without departing from the inventive concept. These are all
within the scope of the present application.
[0035] In order that the object, technical solution, and advantages
of the present application may be more clearly understood, the
present application will now be described in further detail with
reference to the accompanying drawings and embodiments. It should
be understood that the particular embodiments described herein are
illustrative only and are not restrictive to the present
application.
[0036] It should be noted that various features of the embodiments
of the present application can be combined with each other without
conflict within the scope of the present application. In addition,
although the functional module division is made in the device
schematic diagram, in some cases, it may be different from the
module division in the device. Furthermore, the words "first",
"second", "third", and the like, as used herein do not limit the
order of the data and execution, but merely distinguish between
identical or similar items that perform substantially the same
function and role.
[0037] Unless defined otherwise, all technical and scientific terms
used in the description have the same meaning as commonly
understood by one of ordinary skill in the art to which this
application belongs. The terms used in the description of the
present application are for the purpose of describing specific
implementation modes only and are not intended to be limiting of
the present application. As used in the description, the term
"and/or" includes any and all combinations of one or more of the
associated listed items.
[0038] Furthermore, the technical features involved in various
implementation modes of the present application described below can
be combined as long as they do not conflict with each other.
[0039] Specifically, embodiments of the present application will be
further described with reference to the accompanying drawings.
[0040] An embodiment of the present application provides a battery.
Referring to FIG. 1, which shows a block diagram of a circuit
principle of a battery 100, the battery 100 comprises a battery
cell B, a negative electrode interface P-, and a positive electrode
interface P+. The positive electrode of the battery cell B is
connected to the positive electrode interface P+. The battery 100
further comprises a first resistor R1 and a protection chip U1.
[0041] One end of the first resistor R1 is connected to the
negative electrode of the battery cell B, and the other end is
connected to the negative electrode interface P-. The protection
chip U1 comprises a power detection end 10 and a communication
interface 20. The power detection end 10 is connected to the first
resistor R1. The protection chip U1 is configured to detect power
information of the battery cell B via the power detection end 10,
and send the power information to a microprocessor via the
communication interface 20.
[0042] In an embodiment of the present application, the battery 100
is suitable for the use in all diagnostic instruments or diagnostic
tablets with batteries; the microprocessor refers to a
microprocessor within a diagnostic instrument or a diagnostic
tablet, such as a TPMS diagnostic tool, an endoscopic diagnostic
tool, an anti-theft product detection tool, a battery detection
tool, an infrared thermal imaging detection tool, a four-wheel
aligner detection tool, etc.
[0043] In addition, the positive electrode interface P+ and the
negative electrode interface P- are configured to connect a load or
a charger. Under the condition that the battery 100 is in normal
operation, when the positive electrode interface P+ and the
negative electrode interface P- are connected to a load, the
battery 100 is in a discharging state and supplies power for the
load; when the positive electrode interface P+ and the negative
electrode interface P- are connected to a charger, the battery 100
is in a charged state, and the charger supplies power to the
battery 100.
[0044] An embodiment of the present application provides a battery
that has application in automotive diagnostic tablets. The battery
comprises a battery cell, a positive electrode interface, and a
negative electrode interface. The positive electrode of the battery
cell is connected to the positive electrode interface. The battery
futher comprises a first resistor and a protection chip. One end of
the first resistor is connected to the negative electrode of the
battery cell, and the other end of the first resistor is connected
to the negative electrode interface. The protection chip comprises
a power detection end and a communication interface, and the power
detection end is connected to the first resistor. The protection
chip is configured to detect the power information of the battery
cell by means of the power detection end, and the power information
is sent by means of the communication interface to a
microprocessor. The battery according to the embodiment of the
present application combines the functions of power detection and
battery cell protection, and, by means of a protection chip, is
capable of directly detecting the power state of a battery cell
with small detection errors.
[0045] In some embodiments, reference is made to FIG. 2, which
shows a block diagram of a circuit principle of another battery
100. The battery 100 further comprises a switching circuit 110.
[0046] The input end 30 of the switching circuit 110 is connected
to the positive electrode of the battery cell B, and the output end
40 of the switching circuit 110 is connected to the positive
electrode interface P+. The protection chip U1 is further provided
with a positive electrode voltage end VDD, a negative electrode
voltage end VSS, and an execution end 50; the execution end 50 of
the protection chip U1 is connected to the control end 60 of the
switching circuit 110; the positive electrode voltage end VDD and
the negative electrode voltage end VSS are respectively connected
to the positive electrode of the battery cell B and the negative
electrode of the battery cell B.
[0047] When it is detected that the voltage of the battery cell B
is higher than a first preset voltage, the protection chip U1
controls the switching circuit 110 to be in a first state via the
execution end 50. When the switching circuit 110 is in the first
state, the current of the switching circuit 110 cannot flow from
the positive electrode interface P+ to the battery cell B, but the
current of the switching circuit 110 can flow from the battery cell
B to the positive electrode interface P+. That is, the battery cell
B is in a dischargeable, but a non-chargeable state.
[0048] When it is detected that the voltage of the battery cell B
is lower than a second preset voltage, the protection chip U1
controls the switching circuit 110 to be in a second state via the
execution end U1. When the switching circuit 110 is in the second
state, the current of the switching circuit 110 can flow from the
positive electrode interface P+ to the battery cell B, but the
current of the switching circuit 110 cannot flow from the battery
cell B to the positive electrode interface P+. That is, the battery
cell B is in a chargeable but non-dischargeable state.
[0049] With continued reference to FIG. 2, the protection chip U1
is further provided with a current detection end PACK, the current
detection end PACK is connected to a link between the switching
circuit 110 and the positive electrode interface P+, and the
protection chip U1 is configured to control the switching circuit
110 to be in the second state via the execution end 50 when the
current detection end PACK detects that the current of the
switching circuit 110 is greater than the preset current. That is,
the battery cell B is in a chargeable but non-dischargeable
state.
[0050] With continued reference to FIG. 2, the protection chip U1
is further provided with a resistance detection end TS. The
resistance detection end TS is connected to a thermistor (not
shown) in the battery cell B. The protection chip U1 is configured
to detect the resistance value of the thermistor in the battery
cell B via the resistance detection end TS, and control the
switching circuit 110 to be switched off when the detected
resistance value is not within a preset resistance value range.
[0051] In some embodiments, reference is made to FIG. 3, which
shows a schematic diagram of a circuit structure of the battery 100
as shown in FIG. 2. The embodiment of the present application takes
one battery cell as an example, and it needs to be noted that the
battery cell B may be one or more in number according to different
application scenarios, and the number of the battery cells is not
limited in the present application.
[0052] Specifically, the power detection end 10 comprises a charged
power detection end SRP and a discharged power detection end SRN.
The charged power detection end SRP is connected to the link
between the negative electrode of the battery cell B and the first
resistor R1, and the discharged power detection end SRN is
connected to the link between the first resistor R1 and the
negative electrode interface P-.
[0053] In the embodiment of the present application, the current
and direction flowing through the first resistor R1 can be detected
through the charged power detection end SRP and the discharged
power detection end SRN so as to count the total amount of charged
charge or discharged charge, so that the charging chip U1 can
realize the function of a voltameter.
[0054] Specifically, when it is detected that the voltage value of
the charged power detection end SRP is lower than the voltage value
of the discharged power detection end SRN, the battery 100 is in a
charging state. The power is supplied to the battery 100 through an
external charger, at this moment, the voltage drop between the
charged power detection end SRP and the discharged power detection
end SRN is acquired, and in combination with the resistance value
of the first resistor R1, the power information of the charging of
the battery 100 can be calculated and obtained.
[0055] When it is detected that the voltage value of the charged
power detection end SRP is higher than the voltage value of the
discharged power detection end SRN, the battery 100 is in a
discharging state. The battery 100 supplies power for an external
load, at this moment, the voltage drop between the charged power
detection end SRP and the discharged power detection end SRN is
acquired, and in combination with the resistance value of the first
resistor R1, the power information of the discharging of the
battery 100 can be calculated and obtained.
[0056] In some embodiments, with continued reference to FIG. 3, the
battery 100 further includes a first capacitor C1 in parallel with
the first resistor R1. The first capacitor C1 is a filter
capacitor, the capacitance value of the first capacitor C1 is 0.1
microfarads, and the resistance value of the first resistor R1 is
0.001 ohm.
[0057] The communication interface 20 is an inter integrated
circuit (I2C) interface, the communication interface 20 comprises
an SCL communication port and an SDA communication port, and the
protection chip U1 is electrically connected to the charging chip
via the SCL communication port and the SDA communication port, and
is communicatively connected to the microprocessor via the SCL
communication port and the SDA communication port.
[0058] With continued reference to FIG. 3, the switching circuit
110 comprises a first switch tube Q1 and a second switch tube Q2.
The source electrode of the first switch tube Q1 is connected to
the positive electrode of the battery cell B, the drain electrode
of the first switch tube Q1 is connected to the drain electrode of
the second switch tube Q2, the source electrode of the second
switch tube Q2 is connected to the positive electrode interface P+,
and the first switch tube Q1 and the second switch tube Q2 both
have a body diode. The body diode of the first switch tube Q1
enablesthe current of the switching circuit 110 to flow from the
battery cell B in the direction of the positive electrode interface
P+, and the body diode of the second switch tube Q2 enables the
current of the switching circuit 110 to flow from the positive
electrode interface P+ in the direction of the battery cell B. The
first switch tube Q1 and the second switch tube Q2 are both N-metal
oxide semiconductor (NMOS) tubes.
[0059] The execution end 50 of the protection chip U1 comprises a
charging protection execution end CHG and a discharging protection
execution end DSG. The charging protection execution end CHG is
connected to the gate of the first switch tube Q1, and the
discharging protection execution end DSG is connected to the gate
of the second switch tube Q2.
[0060] In an embodiment of the present application, when the
battery 100 is normally charged or discharged, both the charging
protection execution end CHG and the discharging protection
execution end DSG of the protection chip U1 output a high level,
and both the first switch tube Q1 and the second switch tube Q2 are
in a conductive state. Furthermore, the first preset voltage is
4.4V, and the second preset voltage is 2.9V.
[0061] When it is detected through the positive electrode voltage
end VDD and the negative electrode voltage end VSS that the voltage
of the battery cell B is higher than 4.4V, the charging protection
execution end CHG outputs a low level, and controls the first
switch tube Q1 to turn off so as to cut off a charging loop, so
that the external charger cannot charge the battery cell B, thereby
playing the role of overcharge protection. At this time, the
battery cell B can discharge the external load through the body
diode due to the presence of the body diode of the first switch
tube Q1. When the protection chip U1 detects that the voltage of
the battery cell B is lower than 4.2V, the charging protection
execution end CHG outputs a high level, the first switch tube Q1
returns to the conductive state again, and the charger can charge
the battery cell B again. The overcharge protection time is very
short, usually set within 3s to avoid misjudgment due to
interference.
[0062] When it is detected through the positive electrode voltage
end VDD and the negative electrode voltage end VSS that the voltage
of the battery cell B is lower than 2.9V, the discharging
protection execution end DSG outputs a low level, and controls the
second switch tube Q2 to turn off, so as to cut off the discharging
loop, so that the battery cell B cannot discharge the external
load, thereby playing the role of overdischarge protection. At this
time, the charger can charge the battery cell B through the body
diode due to the presence of the body diode of the second switch
tube Q2. When a charging chip (not shown) electrically connected to
the protection chip U1 detects that the voltage of the battery cell
B is higher than 2.95V, the discharging protection execution end
DSG outputs a high level, the second switch tube Q2 returns to the
conductive state again, and the battery cell B can charge the
external load again. The overdischarge protection time is very
short, usually set within 3s to avoid misjudgment due to
interference.
[0063] With continued reference to FIG. 3, the battery 100 further
includes a thermistor RT1. One end of the thermistor RT1 is
respectively connected to the resistance detection end TS and a
negative electrode of the battery cell B, and the other end of the
thermistor RT1 is grounded.
[0064] Specifically, during the charging process, the temperature
of the battery cell B will rise. When the resistance detection end
TS detects that the resistance value of the thermistor RT1 is less
than 4.8879 k ohms, it indicates that the temperature of the
battery cell B is greater than 45 degrees, and the protection chip
U1 rapidly controls the charging protection execution end CHG to
output a low level so as to close the first switch tube Q1, thereby
realizing the function of high-temperature protection. When the
resistance detection end TS detects that the resistance value of
the thermistor RT1 is greater than 27.965K ohms, it indicates that
the temperature of the battery cell B is lower than 0 degree, and
the protection chip U1 rapidly controls the charging protection
execution end CHG to output a low level so that the first switch
tube Q1 is closed, thereby realizing the function of
low-temperature protection. The detection results of the
above-mentioned high-temperature protection and low-temperature
protection can be reported to the microprocessor via the
communication port 20 so as to realize an active temperature
control function.
[0065] In addition, during the discharging process, the temperature
of the battery cell B will rise. When the resistance detection end
TS detects that the resistance value of the thermistor RT1 is less
than 3.0072K ohms, it indicates that the temperature of the battery
cell B is greater than 60 degrees, and the protection chip U1
rapidly controls the discharging protection execution end DSG to
output a low level so as to close the second switch tube Q2,
thereby realizing the function of high-temperature protection. When
the resistance detection end TS detects that the resistance value
of the thermistor RT1 is greater than 72.8183K ohms, it indicates
that the temperature of the battery cell B is lower than -20
degrees, and the protection chip U1 rapidly controls the
discharging protection execution end DSG to output a low level so
that the second switch tube Q2 is closed, thereby realizing the
function of low-temperature protection. The detection results of
the above-mentioned high-temperature protection and low-temperature
protection can be reported to the microprocessor via the
communication port 20 so as to realize an active temperature
control function.
[0066] In some embodiments, with continued reference to FIG. 3, the
battery 100 further includes a second resistor R2 and a second
capacitor C2, the second resistor being a current limiting resistor
connected between the positive electrode of the battery cell B and
the positive electrode voltage end VDD. One end of the second
capacitor C2 is a filter capacitor connected to the link between
the second resistor R2 and the positive electrode voltage end
VDD.
[0067] With continued reference to FIG. 3, the battery 100 further
includes a third resistor R3, a fourth resistor R4, a fifth
resistor R5, a sixth resistor R6, a seventh resistor R7, and an
eighth resistor R8. The third resistor R3 is connected between the
charging protection execution end CHG and the gate of the first
switch tube Q1, and the fourth resistor R4 is connected between the
gate of the first switch tube Q1 and the source electrode of the
first switch tube Q1; the fifth resistor R5 is connected between
the discharging protection execution end DSG and the gate of the
second switch tube Q2, and the sixth resistor R6 is connected
between the gate of the second switch tube Q2 and the source
electrode of the second switch tube Q2; one end of the seventh
resistor R7 is connected to the charged power detection end SRP,
and the other end is connected between the negative electrode of
the battery cell B and the link of the first resistor R1; one end
of the eighth resistor R8 is connected to the discharged power
detection end SRN, and the other end is connected between the
negative electrode port P- and the link of the first resistor R1.
The third resistor R3, fourth resistor R4, fifth resistor R5, sixth
resistor R6, seventh resistor R7, and eighth resistor R8 are all
divider resistances. The resistance values of the third resistor R3
and the fifth resistor R5 are 5.1k ohms, the resistance values of
the fourth resistor R4 and the sixth resistor R6 are 10M ohms, and
the resistance values of the seventh resistor R7 and the eighth
resistor R8 are 100 ohms.
[0068] With continued reference to FIG. 3, the battery 100 further
includes a third capacitor C3, a fourth capacitor C4, a fifth
capacitor C5, and a sixth capacitor C6. After the third capacitor
C3 and the fourth capacitor C4 are connected in series, they are
connected between the source electrode of the first switch tube Q1
and the source electrode of the second switch tube Q2. After the
fifth capacitor C5 and the sixth capacitor C6 are connected in
series, they are connected between the positive electrode interface
P+ and the negative electrode interface P-. These two sets of
capacitors connected in series being respectively arranged can
enhance the voltage withstand capability of the capacitor and
prevent the capacitor from breaking down the short circuit due to
overvoltage which causes the battery cell to burn out due to large
current. The capacitance values of the third capacitor C3, the
fourth capacitor C4, the fifth capacitor C5, and the sixth
capacitor C6 are all 0.1 microfarads.
[0069] In an embodiment of the present application, the preset
current is 6A. Referring to FIG. 3 together, the battery 100
further includes a ninth resistor R9. One end of the ninth resistor
R9 is connected to the current detection end PACK, and the other
end is connected to a link between the switching circuit 110 and
the positive electrode interface P+; the current detection end PACK
of the protection chip U1 detects the passing current via the ninth
resistor R9; when the detected charging current is greater than 6A,
the protection chip U1 outputs a low level via the charging
protection execution end CHG, and controls the first switch tube Q1
to switch off, so as to cut off a charging loop so that the charger
cannot charge the battery cell B, thereby playing the role of
charging protection. At this time, the battery can discharge the
external load through the body diode due to the presence of the
body diode of the first switch tube Q1. When the protection chip U1
detects that the battery voltage is lower than 4.2V, the charging
protection execution end CHG outputs a high level, the first switch
tube Q1 returns to the conductive state again, and the charger can
charge the battery again. The overcharge protection time is very
short, usually set within 2s to avoid misjudgment due to
interference.
[0070] Furthermore, when the discharging current passes through the
first switch tube Q1 and the second switch tube Q2 connected in
series during the normal load discharging of the battery cell B,
one voltage drop is generated at both ends due to the internal
resistance of the channel of the MOS tube. When the voltage drop
detected by the current detection end PACK of the protection chip
U1 is greater than 0.1V, it indicates that the loop current is too
large, and the discharging protection execution end DSG outputs a
low level to switch off the second switch tube Q2, thereby cutting
off the discharging loop and realizing the function of over-current
protection. The time for detecting discharging over-current is very
short, usually set within 2s to avoid misjudgment due to
interference.
[0071] Furthermore, in the process of load discharging by the
battery cell B, if the loop current is so large that the voltage
drop detected by the current detection end PACK is greater than
0.9V, it indicates a short circuit of the load, and the protection
chip U1 rapidly controls the discharging protection execution end
DSG to output a low level to switch off the second switch tube Q2
so as to realize the function of short circuit protection. The time
for short circuit detection is very short, usually set within 1 ms
to avoid misjudgment due to interference.
[0072] An embodiment of the present application also provides an
automotive diagnostic tablet. Referring to FIG. 4, there is shown a
block diagram of the structure of an automotive diagnostic tablet
200, including a micro controller unit (MCU), a charging chip U2,
and a battery 100 as described above from FIG. 1 to FIG. 3 and in
related embodiments.
[0073] The MCU is communicatively connected to the charging chip U2
and the communication interface 20 of the battery 100 respectively.
The charging chip U2 is electrically connected to the battery 100,
the charging chip U2 can be used for controlling the charging and
discharging of the battery 100, and the MCU can perform data
interaction with the charging chip U2 and the battery 100
respectively. In an embodiment of the present application, the MCU
is communicatively connected to the charging chip U2 and the
battery 100 through an I2C bus, respectively.
[0074] An embodiment of the present application provides a battery
that has application in automotive diagnostic tablets. The battery
comprises a battery cell, a positive electrode interface, and a
negative electrode interface, the positive electrode of the battery
cell being connected to the positive electrode interface. The
battery also comprises a first resistor and a protection chip. One
end of the first resistor is connected to the negative electrode of
the battery cell, and the other end of the first resistor is
connected to the negative electrode interface. The protection chip
comprises a power detection end and a communication interface, and
the power detection end is connected to the first resistor. The
protection chip is used to detect the power information of the
battery cell by means of the power detection end, and the power
information is sent by means of the communication interface to a
microprocessor. The battery according to the embodiment of the
present application combines the functions of power detection and
battery cell protection, and, by means of a protection chip, is
capable of directly detecting the power state of a battery cell
with small detection errors.
[0075] It should be noted that the device embodiments described
above are merely schematic, wherein the units illustrated as
separate parts may or may not be physically separated, and the
parts shown as units may or may not be physical units, i. e. may be
located in one place, or may also be distributed over multiple
network units. Some or all modules may be selected to achieve the
object of the embodiments and solutions according to actual
needs.
[0076] Finally, it should be noted that: the above embodiments are
merely illustrative of the technical solutions of the present
application, rather than limiting thereto; combinations of
technical features in the above embodiments or in different
embodiments are also possible within the idea of the present
application, and the steps can be implemented in any order, and
there are many other variations of the different aspects of the
present application as described above, which are not provided in
detail for the sake of brevity; although the present application
has been described in detail with reference to the foregoing
embodiments, those of ordinary skills in the art will appreciate
that: the technical solutions disclosed in the above-mentioned
embodiments can still be modified, or some of the technical
features can be replaced by equivalents; such modifications and
substitutions do not depart the essence of corresponding technical
solutions from the scope of the technical solutions of various
embodiments of the present application.
* * * * *